CN102859822B - Unit for estimating amount of heating of battery for power tool, and device for power tool - Google Patents
Unit for estimating amount of heating of battery for power tool, and device for power tool Download PDFInfo
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- CN102859822B CN102859822B CN201180019959.4A CN201180019959A CN102859822B CN 102859822 B CN102859822 B CN 102859822B CN 201180019959 A CN201180019959 A CN 201180019959A CN 102859822 B CN102859822 B CN 102859822B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/46—Accumulators structurally combined with charging apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
- H02J7/0049—Detection of fully charged condition
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2217/00—Temperature measurement using electric or magnetic components already present in the system to be measured
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Portable Power Tools In General (AREA)
Abstract
Calorific value evaluation unit disclosed in a kind of is used for the battery of electric tool and estimates the calorific value of the battery of the power supply as electric tool. Calorific value evaluation unit includes computing device and is arranged in the equipment for electric tool. For computing device from periodically reading detected electric current from current detection means during battery discharge or during charging to battery and increase or subtract calorific value equivalence value according to the detected current value of reading, the current detection means is from the discharge current of outflow battery and flows into the electric current that detection in the charging current of battery corresponds to the time point. Computing device is exported using the calorific value equivalence value for increasing/subtracting as the estimated value for the calorific value for indicating battery.
Description
The cross reference of related application
The priority of the Japanese patent application No.2010-098323 that this International Application claim is submitted to Japan Office on April 21st, 2010, and the whole of Japanese patent application No.2010-098323 are openly incorporated herein by reference.
Technical field
The present invention relates to the caloric value evaluation unit of caloric value that a kind of estimation is used as the battery of the power supply of electric tool, and comprising the equipment for electric tool of this caloric value evaluation unit.
Background technology
Conventional batteries as the power supply of electronic installation has following problem: when charge or temperature range that the temperature departure of interdischarge interval is given time, battery can deterioration.
Therefore, usually propose: as judging that battery will generate heat thus make the result of battery properties deterioration, detect from battery discharging current or go to battery charging current and when detected electric current exceedes predetermined threshold stop charging or electric discharge (such as, see patent documentation 1).
Prior art document
Patent documentation
Patent documentation 1:JP06225451A
Summary of the invention
The problem to be solved in the present invention
But battery temperature not only changes according to discharging current or charging current, and change according to time period of these current values and current flowing.
Therefore, under the certain situation in above-mentioned conventional art, although the little and battery of the caloric value being in battery can carry out the state of charging or discharging without difficulty, work as detected current value when having reached threshold value, still stop charging or electric discharge.
In addition, under certain situation in above-mentioned conventional art, although be in the state that the charging interval section of battery or the oversize so that battery of section discharge time have been heated to high temperature, but because detected current value does not also reach threshold value, so do not stop, to battery charging or from battery discharge, making deterioration of battery thus.
Particularly in the case of the electric tool, heavy current flows through driving power such as motor, and current value and carrier lifetime section depend on the using state of electric tool and change significantly.Therefore, the problem of above-mentioned conventional art is: can not protect battery fully.
In order to suppress this problem, battery temperature can also be detected by serviceability temperature transducer such as thermistor, and stop when working as the overheated judgement temperature that detected temperature reached predetermined or restriction to battery charging or from battery discharge.
But, the surface temperature of what serviceability temperature transducer can detect is battery, and the internal temperature affecting battery life can not be detected.Therefore, battery can not be protected fully by such overtemperature protection of serviceability temperature transducer.
In view of such problem, propose the present invention, an object of the present invention is to provide a kind of equipment for electric tool, in the device, estimation is used for the caloric value of the battery of electric tool and can suppresses caloric value (in other words after reaching limit temperature, internal temperature), wherein, limit temperature is the upper limit of allowed temperature range.
Solve the means of this problem
The present invention for realizing such object relates to the caloric value evaluation unit of a kind of estimation as the caloric value of the battery of the power supply of electric tool.
In the caloric value evaluation unit of a first aspect of the present invention, the electric current of calculation element detected by periodically reading from current sensing means during battery discharge or between to battery charge period, and increase according to the value of the electric current detected described in reading or deduct caloric value equivalence value.At that point, the electric current detected by this calculation element periodically reads from current sensing means, this current sensing means detects the electric current corresponding to this time point from the charging current of the discharging current and the described battery of inflow that flow out described battery.Then, this calculation element using the caloric value equivalence value that increases/deduct as represent battery caloric value estimated value and export.
The caloric value of battery changes according to the electric current flowed during the charge/discharge time section of battery and charge/discharge.Particularly, the larger and charge/discharge time Duan Yuechang of charge/discharge current, caloric value is larger.Therefore, in the present invention, periodically detect the electric current flowing through battery, and carry out the caloric value of estimating battery according to detected current value by increasing/deducting caloric value equivalence value.
Therefore, according to caloric value evaluation unit of the present invention, can between this battery charge period or from the caloric value (in other words, internal temperature) of the electric current flowed during this battery discharge estimating battery exactly.Therefore, when using this estimated value to control the charge/discharge of battery, battery can be suppressed due to overheated and deteriorated when stopping necessarily or limit charge/discharge.
Here, in the present invention, increase/deduct caloric value equivalence value based on the current value detected obtained from current sensing means.For this reason, preferably variable value setting device is set in caloric value evaluation unit.
In the caloric value evaluation unit of a second aspect of the present invention, when detected current value is less than predetermined threshold, this variable value setting device arranges the negative variable value comprising zero, and make the value of detected electric current less, absolute value is larger.On the contrary, when detected current value is greater than or equal to predetermined threshold, this variable value setting device arranges positive variable value, and make the value of detected electric current larger, variable value is larger.Then, this calculation element upgrades this caloric value equivalence value by the negative variable value set by this variable value setting device or positive variable value are added to caloric value equivalence value.
According to caloric value evaluation unit, this caloric value equivalence value (estimated value) will upgrade according to the current cycle flow through during the charge/discharge of battery, and to make the value of electric current larger, caloric value equivalence value is larger, and the value of electric current is less, caloric value equivalence value is less.Therefore, it is possible to carry out the caloric value of estimating battery exactly according to caloric value equivalence value.
Meanwhile, the caloric value of battery is not only changed by the amount of the electric current flowing through battery but also is changed by the surface temperature (thus, ambient temperature) of battery.Particularly, when the surface temperature of battery is low, caloric value is little.Therefore, this variable value setting device can be configured as follows.
In the caloric value evaluation unit of a third aspect of the present invention, this variable value setting device based on the electric current detected by obtaining from current sensing means value and carry out the temperature of Autonomous test battery (particularly, surface temperature or ambient temperature) the detected temperature of temperature-detecting device this variable value is set, the temperature making the value of detected electric current larger and detected is higher, and this variable value is larger.
According to caloric value evaluation unit, even if when the temperature of battery depends on the using state of electric tool and changes significantly, also can increase/deduct this caloric value equivalence value according to temperature.Therefore, it is possible to the caloric value of estimating battery more accurately.
A fourth aspect of the present invention is a kind of equipment for electric tool, comprising above-mentioned caloric value evaluation unit, decision maker and protective device.
In fourth aspect in the equipment of electric tool, decision maker judges whether the estimated value of the caloric value of the expression battery obtained by caloric value evaluation unit has exceeded the settings for overheated judgement pre-set.If this decision maker judges that this estimated value has exceeded these settings, then any one during this protective device carries out stopping process and restriction to process is to protect this battery.Process is stopped to be stop from battery discharge with to the process corresponding to the action of this time point battery charging.Restriction process is that restriction is from battery discharge with to the process corresponding to the action of this time point battery charging.
According to this equipment for electric tool, when the caloric value of battery is between charge period or when interdischarge interval exceedes the settings for overheated judgement, battery can be suppressed owing to there is overheated and the deterioration caused or damage.
Here, when limiting from battery discharge and to any one battery charging, preferably, protective device corrects the charging being used for battery and controls or the control threshold value of control of discharge for battery.
As the control of discharge of battery, such as, knownly following restriction is carried out:
● discharging current is restricted to the discharging current restriction being equal to or less than predetermined threshold
● suppression cell voltage is reduced to the over-discharge can restriction being equal to or less than predetermined threshold
● suppress battery temperature (using the surface temperature that thermistor etc. detects) to exceed the battery temperature restriction of predetermined threshold
On the other hand, the charging as battery controls, and such as, knownly carries out following restriction:
● charging current is restricted to the charging current restriction being equal to or less than predetermined threshold
● the restriction that overcharges of charging is stopped when cell voltage has reached the threshold value judged for full charge
● suppress battery temperature to exceed the battery temperature restriction of predetermined threshold
In the 5th in the equipment of electric tool, protective device is used for the electric current that flows through during threshold value that these charge/discharges control is limited in the charge/discharge of battery by correcting, and suppresses the rising of the temperature of battery (overheated) thus.
Therefore, according to the equipment for electric tool of the 5th aspect, when the caloric value of battery has exceeded the settings for overheated judgement, the charge/discharge of battery easily and reliably can have been limited.
Except the restriction of above-mentioned charge/discharge, protective device can also be configured to perform the control stopping charge/discharge.Particularly, protective device can be configured to: when the caloric value of battery is more than the first settings limit charge/discharge, and when the caloric value of battery has exceeded the second settings being greater than the first settings, stops charge/discharge.This structure can protect battery more reliably.
In addition; protective device can be configured to: if it is determined that device judges exceeding settings from battery discharge or to the estimated value of caloric value between battery charge period; then protective device corrects in next time to battery charging or next time from the control threshold value used during battery discharge, thus any one in restriction charging next time and electric discharge next time.
The above-mentioned equipment for electric tool can be include the battery pack of battery, any one in battery pack is removably attached to power tool body on it and battery pack is removably attached on it battery charger.
In addition, the function of calculation element as above, variable value setting device, decision maker and protective device can be realized by computer service routine.Particularly; the program of at least one for allowing computer to realize in the function of calculation element as above, variable value setting device, decision maker and protective device can be recorded in computer readable recording medium storing program for performing, and provide this recording medium to user.
As computer readable recording medium storing program for performing, such as, disk such as hard disk, CD such as CD-ROM and DVD and semiconductor memory such as USB storage can be listed.
Accompanying drawing explanation
Fig. 1 shows the end view that battery pack is attached to the state of the power tool body of the present embodiment;
Fig. 2 shows the end view of the state that battery pack is separated from the power tool body of the present embodiment;
Fig. 3 A shows the perspective view of the outward appearance of the battery pack of this embodiment, and Fig. 3 B shows the perspective view of the outward appearance of battery charger;
Fig. 4 shows the circuit diagram of the electronic circuit in the power tool body and battery pack being arranged on this embodiment;
Fig. 5 shows the circuit diagram of the electronic circuit in the battery pack and battery charger being arranged on this embodiment;
Fig. 6 shows the flow chart that determination processing is forbidden in the electric discharge performed by the MCU in battery pack;
Fig. 7 is the key diagram of the operation forbidding determination processing for illustration of the electric discharge in Fig. 6;
Fig. 8 shows the change of the count value of the overcurrent counter of the present embodiment and the key diagram of electric discharge shut-down operation;
Fig. 9 shows the key diagram of the electric discharge shut-down operation according to conventional art.
The explanation of Reference numeral
10-main body (power tool body), 14-motor casing, 16-gear box, 18-drill chuck, 20-handle, 22-trigger switch, SW1-main switch, 24-battery pack attachment, 32A-positive terminal, 32B-negative terminal, 34A-signal terminal, 36-controls power circuit, 38-input/output circuitry, L1A-cathode power supply line, L1B-anode power cord, M1-drive motor, Q1-transistor (N-channel MOS FET), 40-battery pack, 42-connector portion, 44-power supply terminal portion, 44A-positive terminal, 44B-negative terminal, 46-splicing ear portion, 46A ~ 46C-signal terminal, 50-battery, 52A-positive terminal, 52B-negative terminal, 60-battery control circuit, 62-current measurement circuit, 64-tension measuring circuit, 66-temperature measuring circuit, 68-switching manipulation testing circuit, 70-MCU, 70A-ROM, 72-battery charger testing circuit, L2A-cathode power supply line, L2B-anode power cord, Q4-transistor (N-channel MOS FET), 80-battery charger, 82-battery pack attachment, 84-power supply terminal portion, 84A-positive terminal, 84B-negative terminal, 86-splicing ear portion, 86B, 86C-signal terminal, 88-instruction unit, 92-rectification circuit, 94-charge switch power circuit, 96-MCU, 98-control switch power circuit.
Embodiment
Referring to accompanying drawing, embodiments of the invention are described.
(overall arrangement of electric tool)
As shown in Figure 1, comprise according to the electric tool of the present embodiment the power tool body (hereinafter also referred to as " main body ") 10 that is configured as so-called electric drill and be removably attached to main body 10 to provide the battery pack 40 of direct current (DC) power supply to main body 10.
The handle 20 that main body 10 comprises motor casing 14, is positioned at the gear box 16 in motor casing 14 front, is positioned at the drill chuck 18 in gear box 16 front and is positioned at below motor casing 14.
Motor casing 14 holds the drive motor M1(of the actuating force producing driving drill chuck 18 rotatably see Fig. 4).
Gear box 16 holds the actuating force transmission of drive motor M1 to the gear mechanism (not shown) of drill chuck 18.
Drill chuck 18 comprises the attachment means (not shown) being removably attached cutter head (not shown) on the front end at drill chuck 18.
Handle 20 is shaped so that the user of electric tool can hold handle 20 by one hand.In the upper front of handle 20, the user be provided with for electric tool drives or stops the trigger switch 22 of drive motor M1.
In addition, in the lower end of handle 20, battery pack attachment 24 is provided with so that battery pack 40 is removably attached to main body 10.
More specifically, as shown in Figure 2, when battery pack attachment 24 is configured such that the user's forward slip battery pack 40 when electric tool, battery pack 40 can be separated from battery pack attachment 24.
As shown in Figure 3A, the connector portion 42 for being connected to the battery charger 80 shown in the battery pack attachment 24 of main body 10 or Fig. 3 B is formed in the upper area of battery pack 40.Connector portion 42 comprises power supply terminal portion 44 and the splicing ear portion 46 for the control circuit that is connected to battery and battery pack 40 inside.
When battery pack 40 to be attached to the battery pack attachment 24 of main body 10 by connector portion 42, battery pack 40 is electrically connected to the internal circuit of main body 10 by power supply terminal portion 44 and splicing ear portion 46, thus can provide direct current (DC) power (see Fig. 4) to main body 10.
As shown in Figure 3 B, the upper area of battery charger 80 is formed with battery pack attachment 82 and comprises and be used to indicate battery charger 80 to the instruction unit 88 of multiple indicator lights of the states such as battery pack 40 charging.
The battery pack attachment 82 of battery charger 80 is configured such that to be coordinated with battery pack attachment 82 by the end in the connector portion 42 by battery pack 40 and is then attached battery pack 40 towards being attached direction slip battery pack 40, wherein, connector portion 41 downwards.
Battery pack attachment 82 is provided with power supply terminal portion 84 and splicing ear portion 86, and when battery pack 40 is attached to battery charger 80, power supply terminal portion 84 and splicing ear portion 86 are electrically connected to power supply terminal portion 44 and the splicing ear portion 46 of battery pack 40 respectively.When each of these portion of terminal is connected to its mating portion, (see Fig. 5) can be charged from battery charger 80 to battery pack 40.
The battery pack attachment 24 of main body 10 is configured to coordinate with the connector portion 42 of battery pack 40 and battery charger 80.
(Circnit Layout of power tool body 10)
Fig. 4 shows the circuit diagram of the circuit for controlling drive motor M1.When battery pack 40 is attached to main body 10, this electric routing battery group 40 and main body 10 are formed.
As shown in Figure 4, main body 10 comprises positive terminal 32A and the negative terminal 32B and the signal terminal 34A for being connected to splicing ear portion 46 in the power supply terminal portion 44 for being connected to battery pack 40.
Positive terminal 32A is connected to one end of drive motor M1 by main switch SW1 and cathode power supply line L1A, and negative terminal 32B is by providing the transistor Q1 of electric current and anode power cord L1B to be connected to the other end of drive motor M1 for controlling to drive motor M1 simultaneously.
In the present embodiment, when by the input signal conducting from battery pack 40, main switch SW1 is in connection (ON) state to transistor Q1 simultaneously, the drive motor M1 being configured to brush DC-motor is energized and rotates.
Diode (so-called fly-wheel diode) D1 is connected to when drive motor M1 turns off with convenient transistor Q1 and the high voltage produced in anode power cord L1B is returned to cathode power supply line L1A.
Main switch SW1 can and above-mentioned trigger switch 22 switch connecting (ON) and disconnect between (OFF) state synergistically.Particularly, when pressing trigger switch 22, main switch SW1 connects, and main switch SW1 disconnects when unclamping trigger switch 22.
Transistor Q1 used herein is N-channel MOS FET.
Main body 10 also comprise produce for drive internal circuit supply voltage control power circuit 36 and from battery pack 40 input signal/to battery pack 40 output signal input/output circuitry 38.
Control power circuit 36 and comprise Zener diode ZD1 and capacitor C1.The negative electrode of Zener diode ZD1 is connected to cathode power supply line L1A by resistor R1, and the plus earth of Zener diode ZD1 is to the ground of main body 10.
Capacitor C1 is made up of electrolytic capacitor.The side of the positive electrode of capacitor C1 is connected to cathode power supply line L1A by resistor R1 together with the negative electrode of Zener diode ZD1, and the negative side of capacitor C1 is grounding to the ground of main body 10 simultaneously.
Negative terminal 32B is connected to the ground of main body 10.When battery pack 40 is attached to main body 10, the ground of main body 10 is connected to the anode power cord L2B(of battery pack 40 by negative terminal 32B thus is connected to the negative terminal 52B of battery 50).
In addition, when main switch SW1 is in connection (ON) state, cathode power supply line L1A is connected to the cathode power supply line L2A(of battery pack 40 by positive terminal 32A thus is connected to the positive terminal 52A of battery 50).
Therefore, in control power circuit 36, when main switch SW1 is in on-state, cell voltage (such as, 36V direct current) be applied to the anode of Zener diode ZD1 from cathode power supply line L1A by resistor R1, and by Zener diode ZD1, cell voltage is reduced to predetermined constant voltage (such as, 5V direct current).
Then, with the DC voltage reduced, capacitor C1 is charged, and the voltage between two of capacitor C1 terminals is supplied to each internal circuit of main body 10 to encourage these internal circuits as power source voltage Vcc.
Input/output circuitry 38 comprises transistor Q2 and resistor R2, R3, R4 and R5.
Transistor Q2 is made up of NPN bipolar transistor.The base stage of transistor Q2 is connected to signal terminal 34A simultaneously by resistor R4 ground connection by resistor R3.
Power source voltage Vcc is applied to signal terminal 34A by resistor R2, and power source voltage Vcc is also applied to the collector electrode of transistor Q2 by resistor R5.The collector electrode of transistor Q2 is also connected to the grid of transistor Q1, and the grounded emitter of transistor Q2.
Arrange the resistance value of resistor R2, R3 and R4, to make when after connecting at main switch SW1, power source voltage Vcc has reached predetermined voltage, transistor Q2 conducting and the electromotive force of signal terminal 34A become the high level near power source voltage Vcc.
When transistor Q2 is in on-state, the grid of transistor Q1 by transistor Q2 ground connection, thus makes transistor Q1 enter off state to interrupt the current path to drive motor M1.
When signal terminal 34A passes through internal circuit (the transistor Q4 that will the describe after a while) ground connection of battery pack 40, transistor Q2 is made to enter off state.In a state in which, power source voltage Vcc is applied to the grid of transistor Q1 by resistor R5, thus makes transistor Q1 enter conducting state to be formed into the current path of drive motor M1.
Although the collector electrode of transistor Q2 is directly connected to the grid of transistor Q1 in the present embodiment, the collector electrode of transistor Q2 can by being connected to the grid of transistor Q1 for the drive circuit of switching transistor Q1.
(Circnit Layout of battery pack 40)
Battery pack 40 comprises and is arranged on positive terminal 44A in power supply terminal portion 44 and negative terminal 44B, three signal terminals 46A, 46B and the 46C be arranged in splicing ear portion 46, battery 50 and battery control circuit 60.
The positive terminal 52A of battery 50 is connected to positive terminal 44A by cathode power supply line L2A, and the negative terminal 52B of battery 50 is connected to negative terminal 44B by anode power cord L2B simultaneously.
When battery pack 40 is attached to main body 10, positive terminal 44A is connected to the positive terminal 32A of main body 10, and negative terminal 44B is connected to the negative terminal 32B of main body 10, and signal terminal 46A is connected to the signal terminal 34A of main body 10.
Signal terminal 46B and 46C is designed to: when battery pack 40 is attached to battery charger 80, signal terminal 46B and 46C is connected to the splicing ear portion 86 of battery charger 80, and when battery pack 40 is attached to main body 10, signal terminal 46B and 46C is in open state.
Battery 50 is made up of multiple (such as, the 10) battery unit be connected in series between positive terminal 52A and negative terminal 52B, and produces the driving voltage (such as, 36V direct current) for driving this drive motor M1.
Each battery unit is such as made up of the Lithuim rechargeable battery producing separately 3.6V direct current.Therefore, battery 50 can realize high power output, and the discharging current that can export is such as 10A or larger.
Battery control circuit 60 comprises current measurement circuit 62, tension measuring circuit 64, temperature measuring circuit 66, switching manipulation testing circuit 68, battery charger testing circuit 72, main control unit (MCU) 70 and transistor Q4.
Here current measurement circuit 62 is designed to detect the electric current flowing through cathode power supply line L2A or anode power cord L2B, and outputs to MCU 70 by having corresponding to the current detection signal of the magnitude of voltage of detected electric current.
Tension measuring circuit 64 measures the voltage of each battery unit forming battery 50 successively, and outputs to MCU 70 by having corresponding to the voltage detection signal of the magnitude of voltage of the voltage measured.
Comprise the temperature measuring circuit 66 of the thermistor be arranged in around battery 50 via thermosensitive resistance measurement battery temperature, and output to MCU 70 by having corresponding to the temperature detection signal of the magnitude of voltage of measured temperature.
The trigger switch 22 being designed to detect main body 10 is comprised transistor Q3, resistor R6, R7 and R8 by the switching manipulation testing circuit 68 operated.
Transistor Q3 is made up of NPN bipolar transistor.The base stage of transistor Q3 is connected to by resistor R6 signal terminal 46A is grounding to battery pack 40 simultaneously ground by resistor R7.In addition, the grounded emitter of transistor Q3 is to ground.
The ground of battery pack 40 is connected to anode power cord L2B.Therefore, when battery pack 40 is attached to main body 10, the ground of battery pack 40 and the ground of main body 10 have identical electromotive force, and each of these ground has the electromotive force identical with the negative electrode of battery 50.
The collector electrode of transistor Q3 is connected to MCU 70, and is connected to supply voltage Vdd(such as, 5V direct current by resistor R8 from the control power circuit (not shown) be arranged on battery pack 40) output channel.
Control power circuit is designed to: receive power supply from battery 50, produces constant supply voltage Vdd, and to each power electronics in battery pack 40.Control power circuit to be made up of such as switching power circuit etc.
Transistor Q4 is made up of N-channel MOS FET.The drain electrode of transistor Q4 is connected to signal terminal 46A, and the base stage of transistor Q3 is connected to signal terminal 46A by resistor R6.In addition, the source ground of transistor Q4 is to ground, and the grid of transistor Q4 is connected to MCU 70.
Therefore, transistor Q4 is by output signal (discharge control signal that will the describe below) ON/OFF from MCU 70.When transistor Q4 is in off state, signal terminal 46A is in open state.
Therefore, be attached to main body 10 when battery pack 40 and operate trigger switch 22(main switch SW1: connecting) time, if transistor Q4 is in off state, be input to the signal terminal 46A of battery pack 40 from the signal terminal 34A of main body 10 corresponding to the high level signal of the power source voltage Vcc in battery pack 40.Then, the transistor Q3 in switching manipulation testing circuit 68 enters conducting state, and becomes low level from the input signal that switching manipulation testing circuit 68 is input to MCU 70.
Even if when battery pack 40 is attached to main body 10, if do not operate trigger switch 22(main switch SW1: disconnect), then the signal terminal 34A of main body 10 is low level (earth potentials).Then, the transistor Q3 in switching manipulation testing circuit 68 enters off state, and becomes high level from the signal that switching manipulation testing circuit 68 is input to MCU 70.
Battery charger testing circuit 72 is designed so that: when battery pack 40 is attached to battery charger 80 and high level signal (such as 5V direct current) is input to signal terminal 46C from battery charger 80, and battery charger testing circuit 72 exports the detection signal representing this effect.Battery charger testing circuit 72 is configured in the mode identical with switching manipulation testing circuit 68.
Particularly, when signal terminal 46C is in open state, the high level signal corresponding to supply voltage Vdd is input to MCU 70 by pullup resistor by battery charger testing circuit 72.When high level signal is input to signal terminal 46C from battery charger 80, the transistor being connected to the signal path of MCU 70 enters conducting state, and this signal path ground connection is to make the output of MCU 70 for low level.
Therefore, MCU 70 can be attached in battery pack 40 based on the input signal detection from switching manipulation testing circuit 68 in the main body 10 on it and to have operated trigger switch 22, and can be attached to battery charger 80 based on the input signal detection battery pack 40 from battery charger testing circuit 72.
MCU 70 is by comprising CPU, ROM 70A, RAM, rewritable nonvolatile memory, I/O (I/O) port, A/D(analog/digital) the known microcomputer of transducer etc. forms, and operates according to each program be stored in ROM 70A.The operation of MCU70 will be described below.
(Circnit Layout of battery charger 80)
Fig. 5 shows the circuit diagram of the battery charger formed by battery pack 40 and battery charger 80 when battery pack 40 is attached to battery charger 80.
As shown in Figure 5, battery charger 80 comprises positive terminal 84A as power supply terminal portion 84 and negative terminal 84B and signal terminal 86B and 86C as splicing ear portion 86, wherein, positive terminal 84A and negative terminal 84B is connected respectively to positive terminal 44A and the negative terminal 44B of battery pack 40, and signal terminal 86B and 86C is connected respectively to signal terminal 46B and 46C of battery pack 40.
Battery charger 80 also comprises rectification circuit 92, charge switch power circuit 94, main control unit (MCU) 96 and control switch power circuit 98.
Rectification circuit 92 is designed to carry out rectification to from the AC voltage exchanging the such as commercial power supply of (AC) power supply, and the output through rectification is outputted to charge switch power circuit 94 and control switch power circuit 98.
Charge switch power circuit 94 is the switching circuits charged to battery 50 based on the output carrying out self-rectifying circuit 92, and by MCU 96 drived control.
MCU 70 in MCU 96 and battery pack 40 is made up of microcomputer.MCU 96 obtains battery status by signal terminal 46B and 86B from the MCU 70 battery control circuit 60, and controls the pattern (charging current, charging voltage etc.) to battery 50 charging by drived control charge switch power circuit 94.
Control switch power circuit 98 is designed to the supply voltage Vee(such as 5V direct current producing the internal circuit for operating MCU 96 etc.).
The ground of battery charger 80 is connected to the negative terminal 52B of battery 50 by the negative terminal 44B of negative terminal 84B and battery pack 40, and the charging voltage produced in charge switch power circuit 94 is applied to the positive terminal 52A of battery 50 by the positive terminal 44A of positive terminal 84A and battery pack 40.
The supply voltage Vee produced in control switch power circuit 98 is applied to the signal terminal 86C of battery charger 80.
Therefore, when battery pack 40 is attached to battery charger 80 and produces supply voltage Vee in control switch power circuit 98, in battery pack 40 side, the high level signal corresponding to supply voltage Vee is input to battery charger testing circuit 72 by signal terminal 86C and 46C.Then, the signal level being input to the detection signal of MCU 70 from battery charger testing circuit 72 will become low level from high level.
Battery charger 80 is provided with the instruction unit 88 comprising multiple indicator light, and indicator light is lighted according to the charged state of battery 50 by MCU 96.
(operation of the MCU 70 in battery pack 40)
Next, the explanation of operation will provided about the MCU 70 in battery pack 40.
MCU 70 is generally operational in park mode (in other words, low-power consumption mode), wherein, whether becomes low level from high level, monitor this detection signal about the detection signal from switching manipulation testing circuit 68 or battery charger testing circuit 72.When the detection signal from switching manipulation testing circuit 68 or battery charger testing circuit 72 becomes low level from high level, MCU 70 is activated and is converted to the normal mode of protection battery 50.
When MCU 70 is in park mode, the discharge control signal outputting to the grid of transistor Q4 from MCU 70 is low level, and transistor Q4 remains on off state.
When MCU 70 is activated by the detection signal (low level) from switching manipulation testing circuit 68, MCU 70 make discharge control signal be high level to make transistor Q4 conducting, and allow discharge from battery 50 to drive motor M1.
In brief, when transistor Q4 enters conducting state, the transistor Q2 in the input/output circuitry 38 in main body 10 enters off state and the transistor Q1 be arranged on the current path of drive motor M1 enters conducting state.As a result, electric current flows through drive motor M1 and rotates to make drive motor M1.
When MCU 70 makes discharge control signal become high level like this and allows discharge from battery 50 to drive motor M1 (that is, from battery 50 interdischarge interval), MCU 70 performs the control of discharge process protecting battery 50 unduly to discharge etc.
In control of discharge process, based on the testing result by current measurement circuit 62, tension measuring circuit 64 and temperature measuring circuit 66 perform limit discharge from discharging current from battery 50 to drive motor M1 restriction process, over-discharge can restriction process and battery temperature restriction process.
Here discharging current restriction process is that the discharging current detected by interdischarge interval current measurement circuit 62 has judged that overcurrent is flowing and by making discharge control signal stop the process of discharging from battery 50 to drive motor M1 as low level when having exceeded default threshold value.
Over-discharge can restriction process is that the cell voltage detected by interdischarge interval tension measuring circuit 64 has judged that battery 50 is in over-discharge state and by making discharge control signal stop the process of discharging from battery 50 to drive motor M1 as low level when having dropped to below default threshold value.
Battery temperature restriction process is that the battery temperature detected by interdischarge interval temperature measuring circuit 66 has judged that battery 50 is in superheat state and by making discharge control signal stop the process of discharging from battery 50 to drive motor M1 as low level when having exceeded default threshold value.
When above-mentioned restriction processes discharge control signal becomes low level and stops discharging from battery 50 to drive motor M1 in any one time, user detects exception and unclamps trigger switch 22.Therefore, main switch SW1 enters off-state, and in main body 10 side, reduces the power source voltage Vcc from controlling power circuit 36 output, thus make the input signal being input to signal terminal 46A from signal terminal 34A be low level.
Therefore, when in above-mentioned restriction process, MCU 70 has stopped discharging from battery 50 to drive motor M1, MCU 70 is by having judged that whether having become high level from the detection signal of switching manipulation testing circuit 68 identifies main switch SW1 and disconnect.
Identifying after main switch SW1 disconnects, MCU 70 waits for that main switch SW1 is closed until predetermined amount of time in the past.When connecting before main switch SW1 in the past predetermined amount of time, MCU 70 again makes discharge control signal be high level and allows electric discharge (in other words, driving drive motor M1).If main switch SW1 does not connect before predetermined amount of time in the past, then MCU70 is converted to park mode.
Unless owing to judging to there is anomaly ratio as overcurrent in above-mentioned restriction process, otherwise MCU70 continues to export discharge control signal (high level), so MCU 70 can not detect the off-state (in other words, shut-down operation trigger switch 22) of main switch SW1 via switching manipulation testing circuit 68.
Therefore, MCU70 measures the dwell time section of the current-carrying of drive motor M1 based on the detection signal from current measurement circuit 62 grade, and MCU 70 exports discharge control signal (high level) after being switched to normal mode from park mode simultaneously.Then, when the dwell time section of current-carrying has reached predetermined amount of time, MCU 70 has been switched to park mode.
When in above-mentioned control of discharge process, MCU 70 it is determined that the presence of the over-discharge can of battery 50 and stops this electric discharge, MCU 70 by the historical storage of over-discharge can in the nonvolatile memory.
Next; when activating MCU 70 by the detection signal (low level) from battery charger testing circuit 72; the various information of the state (cell voltage, battery capacity etc.) representing battery 50 are outputted to the MCU 96 of battery charger 80 by MCU 70 by signal terminal 46B and 86B; then, when starting to charge from battery charger 80 to battery 50, MCU 70 performs the charging control treatment for battery protection.
Perform charging control treatment to make: the testing result of each based on above-mentioned measuring circuit 62,64 and 66 judges whether to occur anomaly ratio as overcharged to battery 50 and/or battery 50 overheated, if judge to exist extremely, then sent the command signal stopping charging or reduction charging current to battery charger 80 by signal terminal 46B and 86B.
Then, when MCU 70 judge to exist overcharging of battery 50 and charge to stop charging in control treatment time, MCU70 is by the historical storage that overcharges in the nonvolatile memory.
Continue this charging control treatment until the detection signal from battery charger testing circuit 72 becomes high level (in other words, until stop from battery charger 80 input supply voltage Vee).When this detection signal becomes high level, MCU 70 judges that battery pack 40 is separated from battery charger 80, and is switched to park mode.
As mentioned above, MCU 70 in battery pack 40 from battery 50 to drive motor M1 electric discharge and from battery charger 80 to battery 50 charge period between, monitor charge/discharge current, cell voltage and battery temperature etc. via current measurement circuit 62, tension measuring circuit 64 and temperature measuring circuit 66 respectively.When each in these parameters exceeded or lower than predetermined threshold time, MCU 70 stop electric discharge or charging to protect battery 50.
But, in such conventional control, due to the caloric value (in other words, internal temperature) of battery 50 can not be detected, be therefore difficult to reliably to protect battery 50 can not be overheated.In some cases, such as, although discharging current and/or surface temperature are less than threshold value, depend on that the internal temperature of the driving condition battery 50 of electric tool has exceeded suitable temperature range, thus make battery 50 deterioration.
Therefore, in the present embodiment, MCU 70 is designed to: when MCU 70 is in normal mode, and determination processing is forbidden in the electric discharge shown in Fig. 6 that MCU 70 performs except above-mentioned control treatment.
The explanation forbidding determination processing about electric discharge will be provided below.
(determination processing is forbidden in electric discharge)
Electric discharge forbids that determination processing is the process repeated by MCU 70 with the constant cycle (such as every 0.5 second).When starting this process, first represent step at S110(S) in determine at this time point it is performing to discharge from battery 50 or performing to charge to battery 50.
Discharge from battery 50 if performed at this time point, then process the S120 proceeded to subsequently, and read discharging current I and battery temperature T from current measurement circuit 62 and temperature measuring circuit 66 respectively.Performed by S120 is not only read discharging current I and battery temperature T.So far read (in other words, reading in section in preset time) multiple discharging current I and multiple battery temperature T is averaged or rolling average respectively, thus remove the error component (in other words, unnecessary noise component(s)) of discharging current I and the battery temperature T obtained from current measurement circuit 62 and temperature measuring circuit 66 respectively.
Next, in S130, calculate the variable value for updated electric current counter based on the discharging current I at this time point place obtained in the process of S120 and battery temperature T.In S140 subsequently, carry out updated electric current counter by the variable value calculated being added to overcurrent counter.
Here, overcurrent counter is designed to the value of the caloric value equivalence with battery 50 to be stored as count value, and this value is the estimated value of the caloric value representing battery 50.
When calculating based on discharging current I and battery temperature T the variable value being used for updated electric current counter in S130, such as, a kind of mapping for this calculating is used.
Configure this mapping to make: such as, as shown in Figure 7, if discharging current I is less than threshold value, then variable value is set to zero or negative, and if discharging current I be equal to, or greater than threshold value, then variable value is set to positive number.For battery 50 each predetermined temperature range and prepare multiple mapping like this.In S130, MCU 70 selects the mapping corresponding to battery temperature T, and uses this mapping to calculate the variable value corresponding to discharging current I.
Arrange the mapping for calculating variable value in Fig. 7, to make discharging current I larger, the variable value for each temperature range of battery 50 is larger.In addition, when the mapping with different temperature ranges is compared mutually, this mapping is set to make to have when battery temperature is higher the variable value of larger discharging current.This is because discharging current I is larger, battery 50 more easily generates heat, and battery temperature T(is particularly thus, the surface temperature of battery 50 and ambient temperature) easily exceedingly raise.
When calculating this variable value in S130, not necessarily need to use above-mentioned mapping, but each being used as in the two-dimensional map of parameter or these value I and T of discharging current I and battery temperature T can be used to be used as operation expression F(I, T of parameter).
Next, have updated overcurrent counter in S140 after, process proceeds to S150, judges whether the value of the overcurrent counter upgraded is greater than or equal to the first settings X1 judged for overcurrent.
If the value of overcurrent counter is equal to, or greater than the first settings X1, then judge that the internal temperature of battery 50 has exceeded permissible range, process proceeds to S160.In S160, by above-mentioned discharging current restriction process, over-discharge can restriction process and battery temperature restriction process for determining to stop the threshold value of electric discharge to correct to limit and discharge from battery 50.
Particularly, the threshold value of the overheated judgement during the threshold value of the over-discharge can judgement during the threshold value of the overcurrent judgement in being processed for discharging current restriction by reduction, raising are processed for over-discharge can restriction and reduction process for battery temperature restriction, can carry out each stopping limiting the electric discharge in processing expediently.
In S160, for correct each corrected value of above-mentioned each threshold value can be steady state value or can arrange as follows according to the value of overcurrent counter: the value of overcurrent counter is larger, and corrected value is larger.
If determine that in S150 the value of overcurrent counter is less than the first settings X1, if or discharge from battery 50 by correcting each threshold value to limit in S160, then process proceeds to S170, judge whether the value of overcurrent counter is equal to, or greater than the second settings X2, this second settings X2 is greater than the first settings X1.
If the value of overcurrent counter is equal to, or greater than the second settings X2, then determine that the internal temperature of battery 50 has reached the limit temperature causing battery 50 deterioration, process proceeds to S180.In S180, discharge from battery 50 by discharge control signal is switched to low level to stop from high level.
If determine that in S170 the value of overcurrent counter is less than the second settings X2, if or stop discharging from battery 50 in S180, then determination processing is forbidden in brief termination electric discharge.Then, in the past after predetermined amount of time, again carry out S110 and process afterwards.
Next, if determine to charge at this time point place battery 50 in S110, then process proceeds to S190.In S190, judge last time interdischarge interval battery 50 the value of overcurrent counter whether reach the first settings X1 or the second settings X2 and restriction or stop discharging from battery 50 thus.
If in interdischarge interval restriction last time or stopped and discharge from battery 50, then determine the state that battery 50 is in internal temperature and easily raises, process proceeds to S200.In s 200, by the MCU 96 charging current limit signal being sent to battery charger 80, the upper current limit of charging to battery 50 is reduced to lower than the upper current limit in normal time, and stops electric discharge and forbid determination processing.
On the contrary, if determine in S190 last time interdischarge interval do not limit or stop discharging from battery 50, then need not any further process and stop electric discharge and forbid determination processing.
(effect of the present embodiment)
As described above, in the present embodiment, the MCU 70 be arranged in battery pack 40 performs the electric discharge shown in Fig. 6 and forbids determination processing.
Forbid in determination processing in electric discharge, from battery pack 40 to drive motor M1 interdischarge interval, discharging current I and battery temperature T is used to carry out the variable value of periodically calculated electric current counter, and by determining the estimated value (value of=overcurrent counter) (S110-S140) of the caloric value representing battery 50 with the updated electric current counter of the variable value calculated.
If estimated value is equal to, or greater than the first settings X1, then discharge from battery 50 by correcting to limit to the threshold value for control of discharge, and if estimated value is equal to, or greater than the second settings X2, then stop discharging (S150-S180) from battery 50.
Therefore, in the present embodiment, the mapping shown in Fig. 7 is utilized to be updated periodically overcurrent counter according to the variable value that discharging current I calculates owing to using, so the value of this overcurrent counter reaches the first settings X1 or the second settings X2 at short notice when discharging current I is larger, and the time reached required for the first settings X1 or the second settings X2 when this discharging current is less is elongated.
This is because the value of overcurrent counter corresponds to the caloric value (in other words, internal temperature) of battery 50, therefore, according to the present embodiment, the caloric value (in other words, internal temperature) of overcurrent counter estimating battery 50 exactly can be used.
In addition, in the present embodiment, owing to limiting based on the caloric value (value of overcurrent counter) of estimation or stopping discharging from battery 50, so can protect battery 50 can not be overheated when stopping necessarily or limit and discharge.
Such as, Fig. 8 show suppose user in order to screw etc. the measurement result of the current value of discharging current and the count value of overcurrent counter during repetitive operation trigger switch 22.
Obviously can draw from Fig. 8, when user's repetitive operation trigger switch 22, during the operation of trigger switch 22, the count value of overcurrent counter increases according to the current value of flowing, and the count value of overcurrent counter reduces during the operation stopping trigger switch 22.Based on the mapping shown in Fig. 7, the change of count value is set to the change of the caloric value of battery (thus, internal temperature) corresponding.
Therefore, according to the present embodiment, when the caloric value (thus, internal temperature) of battery 50 become greater to must stop electric discharge time, the count value of overcurrent counter reaches the threshold value " Y " (the=the second settings X2) stopping electric discharge.
On the contrary, in the conventional technology, only determine that battery 50 exists based on discharging current overheated, thus stop electric discharge.Therefore, as shown in Figure 9, when user operates trigger switch 22 in a fashion similar to that previously described, if discharging current becomes larger, although internal temperature is not high, electric discharge to but be stopped.Fig. 9 shows and stops the condition of electric discharge to be that the discharging current of battery 50 has become and is equal to, or greater than threshold value " X " and the key diagram of the situation in this state continuance 1 second or more.
Thus, according to the present embodiment, battery 50 can be protected not to be subject to when stopping or limiting electric discharge necessarily overheated, thus improve the availability of electric tool.
In addition, forbid in determination processing in the electric discharge of the present embodiment, when when to limit based on overcurrent counter (estimated value of caloric value) from battery 50 interdischarge interval or stop electric discharge, next time to the charge period of battery 50 between charging current limit signal is sent to the MCU of battery charger 80, thus than limiting the upper limit of charging current in normal time more.Therefore, according to the present embodiment, charge period from next time to battery 50 between can suppress the overheated of battery 50.
Here, in the present embodiment, the current measurement circuit 62 be arranged in battery pack 40 corresponds to an example of current sensing means, and temperature measuring circuit 66 corresponds to an example of temperature-detecting device.
Electric discharge shown in Fig. 6 forbids that the process of the S120-S140 in determination processing corresponds to an example of calculation element of the present invention.Among these process, the process of S130 corresponds to an example of variable value setting device of the present invention.
Electric discharge shown in Fig. 6 forbids that the determination processing of S150 and S170 in determination processing corresponds to an example of decision maker of the present invention, and the process of S160, S180 and S200 corresponds to an example of protective device of the present invention.
(modified example)
Although be described above one embodiment of the present of invention, the present invention should not be limited to above-described embodiment, but can implement in a variety of manners in the scope not deviating from spirit of the present invention.
Such as, describe in the above-described embodiments: when the variable value of calculated electric current counter, use discharging current I and battery temperature T.But, only can calculate variable value with discharging current I.
In addition, describe in the above-described embodiments: the value (estimated value of caloric value) according to overcurrent counter carries out the restriction of this electric discharge and the stopping of electric discharge.But, even if when being configured to carry out any one in the stopping of restriction and the electric discharge of discharging, compared with legacy equipment, also can protect battery 50 better.
In addition, describe in the above-described embodiments: using overcurrent counter to carry out the caloric value of estimating battery 50 from battery 50 interdischarge interval, and controlling restriction and the stopping of this electric discharge.In this, also to be similar to the caloric value of mode at estimating battery 50 between battery 50 charge period of above-described embodiment, and can to limit or stop charging to battery 50.
In addition, describe in the above-described embodiments: forbid determination processing by the MCU 70 in battery pack 40 to perform the electric discharge shown in Fig. 6.But, this electric discharge can be performed by the MCU for control of discharge being arranged on main body 10 side and forbid determination processing.
Further, when described above when being limited by the caloric value of estimating battery 50 between battery 50 charge period or stopping charging to battery 50, by the MCU70 in battery pack 40 or the process forbidding for charging judging can be performed by the MCU 96 in battery charger 80.
On the other hand, although described the situation that the present invention is applied to electric drill in the above-described embodiments, the present invention can be applied to the electric tool except electric drill.
In addition, although use brush DC-motor as drive motor M1 at above-described embodiment, also brushless DC motor or alternating current motor can be used.But, when using brushless DC motor or alternating current motor as drive motor M1, need correspondingly disposal subject 10.
In addition, although the transistor used in the above-described embodiments is bipolar transistor or MOSFET, the switch element except these transistors can be used.
Claims (6)
1. for a caloric value evaluation unit for the battery of electric tool, described caloric value evaluation unit is arranged in the equipment for electric tool, and estimation is as the caloric value of the battery of the power supply of electric tool, and described unit comprises:
Calculation element, the electric current of described calculation element detected by periodically reading from current sensing means during described battery discharge or between to described battery charge period, and the value of electric current according to detecting described in reading increases or deducts caloric value equivalence value, described current sensing means is detecting the discharging current that flows out from described battery and detecting the charging current flowing into described battery between to described battery charge period during described battery discharge;
Wherein, described calculation element using the caloric value equivalence value that increases/deduct as represent described battery caloric value estimated value and export, and be added to caloric value equivalence value by the negative variable value of the value by the electric current detected described in basis or positive variable value and upgrade described caloric value equivalence value
Wherein, described calculation element comprises variable value setting device, described variable value setting device arranges variable value, to make: when the value of the described electric current detected is less than predetermined threshold, the negative variable value comprising zero is set, the value of the electric current detected described in making is less, and the absolute value of described variable value is larger; And when the value of the described electric current detected is greater than or equal to described predetermined threshold, arrange positive variable value, the value of the electric current detected described in making is larger, and described variable value is larger, and
Wherein, described caloric value equivalence value is upgraded by the described negative variable value arranged by described variable value setting device or described positive variable value are added to described caloric value equivalence value.
2. as claimed in claim 1 for the caloric value evaluation unit of the battery of electric tool,
Wherein, described variable value setting device arranges described variable value based on the value of the described electric current detected and the temperature detected of temperature-detecting device of the temperature of carrying out battery described in Autonomous test, with the value of the electric current detected described in making larger and described in the temperature that detects higher, described variable value is larger.
3., for an equipment for electric tool, comprising:
As claimed in claim 1 or 2 for the caloric value evaluation unit of the battery of electric tool;
Decision maker, described decision maker judges whether the described estimated value of the described caloric value of the described battery of expression obtained by described caloric value evaluation unit has exceeded the settings for overheated judgement pre-set; And
Protective device; if described decision maker judges that described estimated value has exceeded described settings; then described protective device protects described battery by any one execution in following process: stop judging that described estimated value has exceeded the stopping process of the action of the time point of described settings from described battery discharge with to corresponding to described battery charging, and from described battery discharge with to corresponding to described battery charging, restriction judges that described estimated value has exceeded the restriction process of the action of the time point of described settings.
4. as claimed in claim 3 for the equipment of electric tool,
Wherein, if described decision maker judges that described estimated value has exceeded described settings; then described protective device is by correcting the control of discharge being used for described battery or the control threshold value controlled for the charging of described battery, limits from described battery discharge with to any one described battery charging.
5. as claimed in claim 4 for the equipment of electric tool,
Wherein, if described decision maker judges that described estimated value is exceeding described settings from described battery discharge or between described battery charge period, then described protective device corrects in next time to described battery charging or next time from the control threshold value used during battery discharge.
6. the equipment for electric tool as described in any one in claim 3 to 5, wherein, described equipment be include the battery pack of described battery, any one in described battery pack is removably attached to power tool body on it and described battery pack is removably attached on it battery charger.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-098323 | 2010-04-21 | ||
| JP2010098323A JP5524694B2 (en) | 2010-04-21 | 2010-04-21 | Device for estimating calorific value of power tool battery and power tool device |
| PCT/JP2011/059022 WO2011132561A1 (en) | 2010-04-21 | 2011-04-11 | Device for estimating amount of heating of battery for power tool, and device for power tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102859822A CN102859822A (en) | 2013-01-02 |
| CN102859822B true CN102859822B (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180019959.4A Active CN102859822B (en) | 2010-04-21 | 2011-04-11 | Unit for estimating amount of heating of battery for power tool, and device for power tool |
Country Status (6)
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| US (1) | US8885307B2 (en) |
| EP (1) | EP2562895B1 (en) |
| JP (1) | JP5524694B2 (en) |
| CN (1) | CN102859822B (en) |
| RU (1) | RU2012149449A (en) |
| WO (1) | WO2011132561A1 (en) |
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Also Published As
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| EP2562895A1 (en) | 2013-02-27 |
| US8885307B2 (en) | 2014-11-11 |
| CN102859822A (en) | 2013-01-02 |
| JP5524694B2 (en) | 2014-06-18 |
| US20130033790A1 (en) | 2013-02-07 |
| WO2011132561A1 (en) | 2011-10-27 |
| JP2011229318A (en) | 2011-11-10 |
| RU2012149449A (en) | 2014-05-27 |
| EP2562895A4 (en) | 2015-06-17 |
| EP2562895B1 (en) | 2019-02-13 |
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